US57053A

US57053A - Improvement in curtain-fixtures

Info

Publication number: US57053A
Authority: US
Publication date: 1866-08-07
Anticipated expiration: 1883-08-07

Description

' UNITED STATES PATENT OFFICE.

"SELF AND T. B. CARPENTER.

IMPROVEMENT INCURTAIN-FlxTuREs.

Specification forming part of Letters Patent No. 57,053, dated August 7, 1866.

and in Fig. 3 a sectional view of one of the rollers.

My invention is designed to roll the curtain either from the top down or from the bottom up; and it consists in the peculiar mechanism whereby this object is attained; and that others may be enabled toconstruct and arrange my improved fixture, I will proceed to describe` the same as illustrated in the accompanying drawings. W

A A is the frame ofa common window; B, the curtain; C, the upper roll, and D the lower roll. Upon each end of the upper roll are fixed two grooved pulleys,.a, and upon` thelower roll two similar grooved pulleys, d. 0n each side of` the frame I tix a non-elastic cord, f, secured atthe top and bottom by any convenientarrangement, i, by which the said cord may be tightened, it' required. The said cord f passes around each of the pulleys on the upper and lower roll, as `denoted in red, Fig. 2; y t,

Upon one side-say the right-I tiX upon the frame a pulley, F, over which I pass a cord, a, thence `down and iix to a pivot, r, on the lower roll, so that when the cord n is drawn so as to raisethe lower roll `the pivot r will turn freely in the attachment to the cord a thereto. `By thus drawing the 4cord n the lower roll is raised, and in bein g so raised the cord f causes the roll to revolve as fast as it is drawn up.

Upon the opposite side of the frame a similar pulley, I, is fixed, having a vsimilar cord, fm, attached in like manner to the opposite end of the upper roll, as seen: in Fig. 1, so that as this said cord m is drawn up the upper roll will in like manner be caused to revolve and unroll the curtain; or, when permitted, the upper-roll will of its own weight fall and wind the curtain from t-he top downward thus, accordingly as either cord n or fm is'drawn the curtain will be raised from the top or bottom, on when released both rolls will descend.

In winding up therolls, or either one of them, the velocitynvith which the roll is revolved is always the same, `whereas the curtain is being wound faster in proportion to the increasing slze of the roll. In order to make allowance for this increasing size of the roll I attach the pulleys to one or both of the rolls by means of a spring, as seen in VFigf, so thatthe pulley acts upon the roll through the said; spring, the said spring yielding to the increase of the roll winding, or decrease in unwinding. This spring may be attached in various` ways to accomplish the object.

It is not necessary that two rolls always be used, as the curtain may besecured to the frame either at the top or bottom, and a single roll arranged in the manner described, either to roll the curtain from the bottom or top, as

the case may be; but in either case the compensation of the spring described is required. Having, therefore, thus fully describedV my invention, what I claim `as new and useful, and desire to secureby Letters Patent, is-

The combination of the two cords ff, with one or more rolls provided with. pulleys cor responding to the said cords f, and arranged with a compensating spring, and so as to be operatedsubstantially in the manner and for the purpose set forth.

eEo. M. WHITE.

Witnesses:

JOHN E. EARLE, ALTsIE J. TIBBITs.